function f=find_integral_analytic_1dim(W_i,h_w,k_type,sel_kk)

kk2=sel_kk;

if strcmp(k_type,'bi')
	f_w=find_math_bi(h_w,kk2,W_i);
end
if strcmp(k_type,'fourth-bi')
	f_w=find_math_fourthbi(h_w,kk2,W_i);
end

f = (1/(h_w)) * f_w;

	%

